PoE Darkscorn, Fire builds

i just can't get fire to chaos damage or as you can see i attempted to do some ward shenanigans as well but just couldn't get enough to say eat a uber uber attack idk if anyone else wants to use this and improve on it be my guest

I have been playing a Pathfinder, Caustic Arrow Ballista poison build for a bit now and I am liking it a lot. It was not my league starter, but I am thinking of starting it next league as my only character. ( i normally roll a bunch and get bored of it in T16s.) All the gear is super cheap and available. My question is around elevating it more than it is. I think that it is pretty much at a plateau as the upgrades are super expensive, but I was hoping there was some weird interaction that I was missing that would up the DPS. Survivability is great, so no problems there. I imported my ch